Results 61 to 70 of about 1,315 (165)

Rainbows, Polarization, and the Search for Habitable Planets

Astrobiology, 2007
Current proposals for the characterization of extrasolar terrestrial planets rest primarily on the use of spectroscopic techniques. While spectroscopy is effective in detecting the gaseous components of a planet's atmosphere, it provides no way of detecting the presence of liquid water, the defining characteristic of a habitable planet.
openaire   +2 more sources

Smaller Than Earth Habitability Model (STEHM): The Lower Size Limit for Atmosphere Retention in the Habitable Zone

The Planetary Science Journal
With recent advances in exoplanet observational techniques enabling the discovery of increasingly smaller planets, a crucial question emerges in the search for habitable planets: how small can a planet be and still maintain an atmosphere?
Michelle L. Hill, Stephen R. Kane, Bradford J. Foley, Laura K. Schaefer   +3 more
doaj   +1 more source

Stellar Control on Atmospheric Carbon Chemistry, CO Runaway, and Organic Synthesis on Lifeless Earth-like Planets

The Astrophysical Journal
The abundances of atmospheric carbon species—carbon dioxide (CO _2 ), carbon monoxide (CO), and methane (CH _4 )—exert fundamental controls on the climate, redox state, and prebiotic environment of terrestrial planets.
Yoshiaki Endo, Yasuto Watanabe, Kazumi Ozaki   +2 more
doaj   +1 more source

Ocean Tides on Asynchronously Rotating Planets Orbiting Low-mass Stars

The Astrophysical Journal
Planets in the liquid-water habitable zone of low-mass stars experience large tidal forces, 10 ^3 –10 ^4 times those on Earth, due to the small distance between the habitable zone and the host stars.
Jiaru Shi, Jun Yang, Dorian S. Abbot, Yonggang Liu, Wanying Kang, Yufeng Lin   +5 more
doaj   +1 more source

Plausibility of Capture into High-obliquity States for Exoplanets in the M Dwarf Habitable Zone

The Astrophysical Journal
For temperate exoplanets orbiting M-dwarf hosts, the proximity of the habitable zone to the star necessitates careful consideration of tidal effects.
Natalia M. Guerrero, Sarah A. Ballard, Yubo Su   +2 more
doaj   +1 more source

Bioverse: The Habitable Zone Inner Edge Discontinuity as an Imprint of Runaway Greenhouse Climates on Exoplanet Demographics

The Planetary Science Journal
Long-term magma ocean phases on rocky exoplanets orbiting closer to their star than the runaway greenhouse threshold—the inner edge of the classical habitable zone—may offer insights into the physical and chemical processes that distinguish potentially ...
Martin Schlecker, Dániel Apai, Tim Lichtenberg, Galen Bergsten, Arnaud Salvador, Kevin K. Hardegree-Ullman   +5 more
doaj   +1 more source

Albedos, Equilibrium Temperatures, and Surface Temperatures of Habitable Planets. [PDF]

Astrophys J, 2019
Del Genio AD, Kiang NY, Way MJ, Amundsen DS, Sohl LE, Fujii Y, Chandler M, Aleinov I, Colose CM, Guzewich SD, Kelley M.   +10 more
europepmc   +1 more source

X-Ray Emission of Nearby Low-mass and Sunlike Stars with Directly Imageable Habitable Zones

The Astrophysical Journal Supplement Series
Stellar X-ray and UV radiation can significantly affect the survival, composition, and long-term evolution of the atmospheres of planets in or near their host star’s habitable zone (HZ).
Breanna A. Binder, Sarah Peacock, Edward W. Schwieterman, Margaret C. Turnbull, Azariel Y. Virgen, Stephen R. Kane, Alison Farrish, Katherine Garcia-Sage   +7 more
doaj   +1 more source

The Fate of Oceans on First-generation Planets Orbiting White Dwarfs

The Astrophysical Journal
Several groups have recently suggested that small planets orbiting very closely around white dwarf stars could be promising locations for life to arise, even after stellar death.
Juliette Becker, Andrew Vanderburg, Joseph R. Livesey   +2 more
doaj   +1 more source

Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory

The Astronomical Journal
NASA’s Habitable Worlds Observatory (HWO) will be the first space telescope capable of directly imaging Earth-like planets in the habitable zones (HZs) of Sun-like stars to probe their atmospheres for signs of life.
Katie E. Painter, Brendan P. Bowler, Kyle Franson, Juliette C. Becker, Jennifer A. Burt   +4 more
doaj   +1 more source